|Table of Contents|

Research on construction mechanical behavior of turning overhanging at intersection of complex chamber(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
172-182
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on construction mechanical behavior of turning overhanging at intersection of complex chamber
Author(s):
LI Dajun1;  HE Pengfei2;  SONG Kezhi3;  WANG Senwei4
(1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 264038, Shandong, China; 2.The Eighth Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Tianjin 300171, China; 3. School of Civil Engineering, Ludong University, Yantai 264025, Shandong, China; 4.Investment Project Construction Service Center of Yantai Government, Yantai 264030, Shandong, China )
Keywords:
tunnel engineering;  intersection section;  turning overhanging;  construction mechanical behavior;  three-dimensional space effect
PACS:
U455
DOI:
10.19815/j.jace.2022.11120
Abstract:
The construction processes of the intersection parts of the auxiliary tunnel and the main tunnel are complex, easily causing damage to the surrounding rock mass. On the background of the Funiushan Tunnel, a three-dimensional numerical model was built, and the construction processes of the auxiliary tunnel into the main tunnel was simulated using the finite element software PLAXIS3D. The construction mechanical behavior and three-dimensional space effect of the excavation of the intersection parts of the auxiliary tunnel and the main tunnel were studied. The evolution laws surrounding rock mass status, roof settlement, displacement around the tunnel and rock plastic zone were investigated in the construction process. The results show that the construction of the intersection section of the transverse channel will affect the stress distribution of the surrounding rock mass and generate tensile stress near the intersection section. Moreover, the main influence range is about twice the diameter of the tunnel. The final settlement of the vault of the fan room is 3.7-3.9 mm. In the vicinity of the intersection section, the settlements caused by the construction stage of the small guide hole climbing and the reverse excavation of the main hole of the fan room are greater than that caused by the construction of small guide hole. The construction of the contact channel in the left side causes large lateral displacement on the left side of the main hole, resulting in asymmetrically distribution of the displacement. Continuous plastic zones are formed in the fan room and contact channel at the intersection. The plastic points are concentrated in the neighboured of the arch waist and arch foot on both sides of the main tunnel. In view of a small number of tensile failure points at the intersection, the side wall of the upper step and the bottom surface during the expansion of the small pilot tunnel, these parts should be paid attention to in the construction, and the initial support should be applied in time to prevent local falling blocks.

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Last Update: 2023-03-20